Dies



Feb. 5f, 1924.` 1,482,835

E. BOLEY DIES Filed June 9, 1922 Patented Feb. 5, 1924.

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ERNST BOLEY, OF CLEVELAND, OHIO, ASSIGNR- T0 THE AMERICAN STEEL AND WIRE COMPANY 0F NEW JERSEY, A CORPORATON OF NEW JERSEY.

BEES.

Application filed .Tune 9,

To all whom t may concern Be it known that I, ERNST BoLEY, a citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Dies, of which the following is a specification.

rlhis invention relates to die plates and more particularly to wire drawing die plates, and has for its object the provision of an iniproved die plate that will have a materially longer life than die plates heretofore constructed.

Another object of this invention is to provide a die plate composed of high chromium steel and provided with a plurality of rows of drawing holes so arranged and spaced that no uneven internal strains will be set up in the plate when it is tempered or hardened.

A further object of this invention is to provide a die plate having a plurality of drawing holes so arranged and spaced therein that a maximum number of holes may be provided in a given size of plate, and also a substantially equal amount of metal will remain between each hole.

A still further object of this invention is to provide a die plate having the novel construction and advantages hereinafter described and illustrated in the accompanying drawings, in which- Figure 1 is a plan view of a die plate constructed in accordance with this invention.

Figure 2 is a side elevation thereof.

Figure 3 is an end elevation thereof.

Figure 4 is a longitudinal sectional elevation on the line IV-IV of Figure l.

Figure 5 is a cross sectional elevation on the line V-V of Figure l.

Referring more particularly to the drawings, the numeral 2 designates the plate as a whole, which is preferably formed from high chromium forged steel, and is provided with a plurality of rows of holes 3. The rows of holes are composed of two sets of substantially frusto-conical-shape'd holes 4 and 5, which alternate with each other.

The holes 4 enter, that is have their large end opening through one face of the plate, while the holes 5 enter the other face of the late. Therefore the taper of each succeeding hole of the rows 3 is in the opposite direction. The holes 4 and 5 in each row are 1922. serial No. 567,166.

in staggered relation with the holes 4 and 5 of the next adjoining rows.

Each of the holes 4 and 5 have a frustoconical entering portion 6 and a substantially cylindrical drawing portion 7.

If desired the plate may be provided with tapered 'if-shaped slots ror cutaway portions 8 around its edge opposite the holes 4 and 5. The slots or cut away portions 8 are tapered in the opposite direction and at substantially the same taper as the frusto-conical portions 6 of the holes 4 and 5, thereby providing substantially the same thickness of metal around the outer holes of the plate as around the inner holes.

rIhe corners of the plate may also be cut away or beveled as at 9 to reduce the thickness of metal at this point to substantially the same thickness as the metal between the holes in the center of the plate.

,It will be readily seen that a die plate constructed in accordance with this invention will have a maximum number of drawing holes for a given plate area, which is of great importance since the metal from which the plates are made is very expensive. lt will also be seen that due to the even distribution of metal, a plate constructed as described may be readily tempered to the maximum hardness without danger of cracking or breaking, due to the uneven distribution of shrinkage and other internal strains.

The high chromium steel from which the dies of this invention are made is characterized by its extreme hardness and wearing qualities when heat treated and tempered. High chromium steel is so very expensive that heretofore it has been unprotable to make dies therefrom. However, the novel construction of the present die uses Such a small amount of metal for each hole that the expensive chromium steel may be economically used.

It will be understood that while the holes 4 and 5 are preferably formed by drilling and reaming, and the construction of the plate particularly adapts itself to this operation since the multiple drills may be used, I do not wish to be limited to a plate having theV holes drilled therein, since the plates may be cast and the holes formed or partly formed therein when the die plate is cast. It also will be understood that the holes may be of any desired cross section and that the invention, as delined in the broader Claims, is not limited to holes of circular' cross seo tion.

l. A die plate having a plurality of rows of tapering holes therein, each succeeding hole of said rows oit holes entering from opposite sides of said plate, and the holes of each row entering from the same side or said plate being in staggered relation with the holes oi the next adjoining rows entering from the same side of said plate.

2. A die plate having a plurality oi rows ot truste-conical holes therein, said holes being equally spaced holes and each sueeeed ing hole or said rows olf holes entering from opposite sides or' said plate, and the holes ot each row entering from the saine side of said plate being in staggered relation with the holes or the next adjoining rows entering from the saine side, whereby a maximum number of holes is provided in a given surface and the thickness of the metal between the holes is substantially equal throughout the plate.

3. A die plate having a plurality of rows ot holes formed therein, each alternate hole of said rows of holes having the ends opening on one face of said plate reamed out to i'orm a rusto-conical portion, and the other holes of said rows of holes having the ends which open on the opposite face oi said plate reained out to form a frusto-conical portion, the frusto-conical portion oi the holes of each row being in staggered relation in relation to the frusto-oonical portion ot the holes in the adjoining rows.

4. A die plate having a plurality of rows ot equally spaced rusto-conical holes therein, each succeeding hole orn said rows or holes entering Ai'rom opposite sides of said plate, and the holes of each row entering from the same side of said plate being in staggered relation with the holes of the next adjoining rows entering from the same side, the edges of said plate being out away at points opposite the holes or the outer rows and the end holes orn each row, whe 1eby a substantially equall amount of metal surrounds each hole.

A die plate formed of high chromium steel having a plurality or' truste-conical holes therein, and having its outer edges cut away at intervals, said holes and said cutaway portion being so spaced and arranged that a substantially equal amount of metal will surround each ot said holes.

t3. die plate formed of high chromium steel having a plurality of rows oi i'rustoconical shaped holes therein, each succeeding hole of said rows or holes entering from opposite sides of said plate, and the holes of each row entering from the same side of said plate being in staggered relation with the next adjoining rows entering from the same side oi said plate, substantially as de scribed.

7. die plate having a plurality of holes therein shaped and arranged to leave an equal amount of material surrounding each hole, so that the die may be tempered to i'i'ianin'ium hardness without danger of cracking or breaking.

ln testimony whereof, I have hereunto signed my name. y

ERNST BOLEY. 

